Spiral steel pipe (SSAW steel pipe) is a welded steel pipe made by rolling low-carbon carbon structural steel or low-alloy structural steel strip into a tube blank at a certain helical angle (called forming angle), and then welding the pipe seams.

Large-diameter welded pipes generally use double-sided submerged arc welding welded steel pipes, which can be divided into large-diameter straight seam welded pipes and large-diameter spiral welded pipes according to their weld seams.

Because seamless steel pipes work under high temperature and high pressure conditions for a long time, the material will undergo stress relaxation, plastic deformation and ductility reduction, initial structure changes, and corrosion.

After the two edges of the large-diameter welded pipe billet are heated to the welding temperature, under the extrusion of the extrusion roller, the single metal grains formed are infiltrated and crystallized with each other to form a strong weld.

To store seamless pipes, choose a suitable site and warehouse

There are many factors affecting the drawing force in the drawing process of stainless steel pipes. According to the research, some of these factors are beneficial to the drawing process. On the contrary, other factors increase the difficulty of stretching. The drawing process and the performance of the drawn metal, heat treatment, deformation of each pass and drawing speed. The friction between the waste tube and the mold, lubrication, geometric dimensions and mold shape are closely related.